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Unknown Propertyyii\base\UnknownPropertyException

Getting unknown property: common\models\Article::published_at

$_GET = [
    'slug' => 'ekskursia-studentov-instituta-ekonomiki-i-upravlenia-v-korporativnyj-universitet-pervoj-ekspedicionnoj-kompanii-pek',
];

$_SESSION = [
    '__flash' => [],
];